Error-barred Black Circle Symbol
⧳ (error-barred black circle) is a math symbol often used to indicate uncertainty or measurement error.
U+29F3
⧳ is a Unicode character in the Math category. It’s commonly described as the error-barred black circle and can be used in technical writing where uncertainty matters.
Error-barred Black Circle Symbol Meaning
The symbol ⧳ is named “ERROR-BARRED BLACK CIRCLE” (Unicode U+29F3). In practice, it visually resembles a filled circle with error bars, which makes it useful for representing measured values that come with uncertainty. People use it in notes, figures, and annotations to distinguish results with estimated variability, instrument error, or confidence ranges. In math- and science-adjacent contexts, it can also help label graphs, callouts, or legend entries for data points where error bars are relevant. Because it’s a dedicated Unicode character, it can be easier than composing a similar look from multiple marks.
Common uses
- •Labeling data points with uncertainty in charts or plots
- •Adding a legend entry for measured values that include error bars
- •Noting measurement error in lab notes or technical documentation
- •Marking approximate or uncertain results in reports and tables
- •Designing consistent UI icons or badges for “uncertain measurement”
Examples
⧳ Error-Barred Black Circle Symbol
- ⧳Measured diameter: 12.4 ⧳ mm (see error bars).
- ⧳The point marked ⧳ indicates the reported uncertainty range.
- ⧳In the legend, ⧳ corresponds to test results with error bars.
- ⧳Sensor reading (⧳) varies due to calibration tolerance.
- ⧳Repeat trials are shown with ⧳ to highlight measurement error.
Variations
Ready to copy
Technical codes
| Unicode | U+29F3 | |
| HTML Entity | ⧳ | |
| HTML Code | ⧳ | |
| CSS | \29F3 |
FAQ
What does the Error-barred Black Circle symbol mean?
The symbol ⧳ is named “ERROR-BARRED BLACK CIRCLE” (Unicode U+29F3). In practice, it visually resembles a filled circle with error bars, which makes it useful for representing measured values that come with uncertainty. People use it in notes, figures, and annotations to distinguish results with estimated variability, instrument error, or confidence ranges. In math- and science-adjacent contexts, it can also help label graphs, callouts, or legend entries for data points where error bars are relevant. Because it’s a dedicated Unicode character, it can be easier than composing a similar look from multiple marks.
What is the Unicode for ⧳?
⧳ is U+29F3, named “ERROR-BARRED BLACK CIRCLE”.
How do I copy ⧳ into HTML?
Use the HTML entity ⧳.
How can I use ⧳ in CSS?
You can use a CSS unicode escape like \\29F3.
How can I use ⧳ in JavaScript strings?
Use \\u{29F3} in a JavaScript string.